Well, there are a few things to take into consideration, taste preference and health. I still enjoy bread, say, but it has to be really really good bread (like Cohen bakes!) to make me bother, because I know it'll make me feel like crap now. Much in the same way that I have to be in a very compelling social situation to drink enough to give me a serious hangover. Neither are cast iron rules, because (as everyone is quick to remind me), life is too fuckin' short already. To which I typically retort, why go out of your way to make it SHORTER then, but I am sympathetic to it on a gut level.
It's my considered opinion that regardless of your taste preference, all this crap (bread, rice, pasta, sugar, food additives, booze) is bad for you and you should keep your consumption of it as low as possible. It'll be really interesting to compare your health to that of Rodi's in a couple of decades.